<?php
/**
 * Slipstream :: Highly adaptive dependency injection framework
 * Copyright 2010-2011 Ian Unruh (Xerof3ar)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Slipstream\Configuration\Option;

/**
 * Abstract implementation of OptionInterface
 * 
 * @author Ian Unruh (Xerof3ar) <ianunruh@gmail.com>
 * @since Class avaliable since release 1.0
 */
abstract class AbstractOption implements OptionInterface
{
	/**
	 * @var bool
	 */
	protected $changed = false;
	
	/**
	 * @var string
	 */
	protected $name;
	
	/**
	 * @var mixed
	 */
	protected $value;
	
	/**
	 * Class constructor
	 * 
	 * @param string $name
	 * @param mixed $value [optional]
	 * @return void
	 */
	public function __construct($name, $value = null)
	{
		$this->name = $name;
		$this->value = $value;
	}
	
	/**
	 * Returns the name of this option (must be a valid property name)
	 * @return string
	 */
	public function getName()
	{
		return $this->name;
	}
	
	/**
	 * Returns the value of this option
	 * @return mixed
	 */
	public function getValue()
	{
		return $this->value;
	}
	
	/**
	 * Sets and validates the value of this option
	 * 
	 * @throws Exception If set value is not valid
	 * @param mixed $value
	 * @return void
	 */
	public function setValue($value)
	{
		$this->value = $value;
		$this->changed = true;
		
		$this->validate();
	}
	
	/**
	 * Returns true if this option was set
	 * @return bool
	 */
	public function isChanged()
	{
		return $this->changed;
	}
}